>Sorry, Tc...was not able to trace the problem by using the form record in question...all the coding looked okay. However, there was one variable that was not defined, before calling the form, which seemed to be causing this problem. As a result, a record seek was misfiring. I seem to have resolved it.
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>However, my question still remains, as to why does this error message reads as such, and how can I interpret the meaning of the error message with the actual problem at hand.

Things to look for are any function calls, execscript() calls, expressions which may be evaluated, which would involve using "thisform" out of the context of the form and its member objects. Also, not sure whether this could be caused by a mention of thisform in code in an object which is not a member (of a member of a member) of the form, but added as a property.